Flexible conduit.



.A. E. OHERNAGK. FLEXIBLE GONDUIT'. LPPLIUATIOH FILED D30. 20, 190 9.

982,248. Patentd Jan. 24, 1911.

WITNESSES: INVENTOI? w MeW ATTORNEVJ by means of strips 'of paper ABRAHAM E.

CIRCULAR LOOM COMPANY. MASSACHUSETTS.

.72) (1/! whom it may concern:

Be it known that I, ABRAHAM E. CHER- ;mcu, a. subject of the Emperor of Russia, residing in the city of Boston, in the county of Sul'l'olk, in the State of Massachusetts, have ini'ented'a certain new and useful. Improved Flexible Conduit, of which the following is a specification.

In the construction of flexible conduits for electrical conductors, it has been proposed to combine with Woven coverings spiral wra niings of paper or other such suitable material, the layers being cemented together tcrprooling composition. But one/01" the practical ditliculties encountered in the production and use of flexible conduits so constructed has'been the tendency of the tube to buckle and collapse when bent. To overcome this difliculty, I construct my flexible conduit with inner of woven fabric and two intermediate, layers or the like, each coiled spirally with the spires spaced apart and intermediate yielding waterproof composition, which at the same time cements the layers together. i

In the accompanying drawings Figure 1 is a side view of a piece of the flexible conduit, showing the different layers; Fig. 2 is a longitudinal section, showing the conduit bent; Fig. 3 is a transverse section of the conduit. I

I n carrying out my invention, I first weave on a circular loom, a seamless tube A of suitable textile material to form the interior layer of the conduit. I then cover this woneu tube with a. waterproof composition. such for example, as the waterproof compound to be tound on for use in making flexible conduits. I then wind spirally upon this woven tube, while the latter is still upon its supporting core, a strip B ptfiexible insulating material, such as paper or fiber, the winding being such as to leave spaces 7.) between the spires. These spaces are filled by the compound squeezed l'rom the surface otthe seamless tube, as the strip is coiled on with some pressure. Then a second layer of paper or the like is n snares earner OHERNACK, OF BOSTON, MASSACHUSETI3, ASSIGNOB, TO CHERNACK OF BOSTON. DIASSACHUSETTS, A CGRPORATION OF 7 Specification of Letters Patent.

Application filed December 20,1909.

of some flexible and adhesive waand outer tubular layers" the market to-dav- FLEXIBLE CONDUIT.

Patented. Ja n. 24, T2911. Serial No. 534,087.

applied by spirally winding a strip I) thereof upon the top of the first strip, preferably in the same directionas the first spiral layer, and with the spires spaced as before at (Z, but so that the spires of one layer will overlie and cover the spaces between the spires ot' the other layer. Flexible waterproofing and cementing composition is then applied to cover this second layer and till up the spaces between the spires and finally an outer layer E- of woven textile material. is put on, after which the tube is treated with compound and mica, as usual.

By making my conduit as described with a double wrapping of paper or the like in spirally wound strips and intervals between the strips and filling these intervals between the spires with the yielding waterproof composition, I get a very flexible conduit, and one which can be bent without danger of its buckling or collapsing. I do not rely upon the stretching of the material on the outer edge of the "bend in the conduit, but rather upon the contracting at theinner edge of the bend. But since the intervals between spires in each layer are at all times covered by the spires in the other layer, there is pro vidcd the required strength at all points of the conduit.

.I claim as my invention l. A flexible conduit formed of inner and outer layers of tubular fabric, a plurality of intermediate layers of ii'isulating strips each spirally wound with spaces between the spires, the spaces between the spires of one strip alternating With the spaces between the spires of the other strip, and a yielding composition forming a coating for the inner tubular fabric, said composition filling the spaces between the spires of the innermost insulating strip and adhering to the inner surfaceof the overlying insulating strip.

2. A flexible conduit formed of an inner layer of tubular fabric, a water proof composition lorn'iing a (mating for the inner tube, a stuip of insulating material spirally wound about the inner tube with spaces between the spircs, a. second. strip of insulating material spirally wound directly upon'the first-named strip with spaces between the face ofthe second strip, and an outer tubuof said strips.

spires alternating with those of said first strip, said Water proof COIDPOSitiOILGZitEHd- I ing through the spaces of the first strip and l into contact with the overlying inner su1'-- in testimony whereof I have signed my name to this specification, in the presence of two subscribing Witnesses.

ABRAHAM E. CHERNACK. Witnesses:

R. B. ELLMS, EDWARD N. GODING.

lur fabric forming a covering for the second 

